← Who writes the AI shelf

Editorial source · measured July 2026

How ChatGPT uses pubmed.ncbi.nlm.nih.gov to recommend products

pubmed.ncbi.nlm.nih.gov is editorial — the kind of best-of article and buying guide ChatGPT leans on to build a shelf. We saw it cited 865 times across 11 of the 18 categories we measured.

Citations
865
Most-cited rank
#58
Categories
11 of 18
Cited mostly as
Other

Which shelves cite pubmed.ncbi.nlm.nih.gov

The categories where ChatGPT pulled from this source when building a shopping answer. Broad reach means the model trusts it across the store, not just one aisle.

What ChatGPT cites it for

The kind of page ChatGPT pulled from this domain. Best-of lists dominate the shelf across the board — the model reaches for a ranked list far more than a comparison or a product page.

  • Other 100%

The pages ChatGPT pulls from

A few of the most-cited pubmed.ncbi.nlm.nih.gov pages behind these answers.

How we measured this

  • We asked ChatGPT brand-free shopping questions across 18 product categories and recorded every source URL it cited — 293,240 citations in all.
  • This page counts how often pubmed.ncbi.nlm.nih.gov showed up among them. Citation counts are for the public category studies only, not any private client work.
  • A citation is ChatGPT surfacing the source. It is not an endorsement, a link, or traffic.
  • One engine, one country, one point in time. The shelf, and who writes it, moves.

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Other sources that write the shelf